Find the coefficient of x² in (3x² – 5) (4 + 4x²).

Given polynomial = (3x² – 5) (4 + 4x²)

                                    $\begin{array}{c}= 12x^2 + 12x^4 - 20 - 20x^2\\ = 12x^4 - 8x^2 - 20\\ \end{array}$

So, the Coefficient of x² = - 8